W. T. BOVIE AND D. M. HUGHES 329 



ference." This suggestion makes the diffusion of toxic substances 

 out of the radiated cell of interest in connection with the toxemias which 

 often follow large doses of either ultra-violet, Roentgen, or 7-radia- 

 tions. 



However, we cannot arrive at very certain conclusions regarding the 

 processes of recovery until these experiments have been repeated with 

 various exposure times, with various radiation intensities, and at 

 various temperatures. Until the data from such experiments are 

 available we may best leave the subject with the simple statement 

 that during the interval of time between the two exposures the or- 

 ganisms recover from the effects of the first 4 second exposure so that 

 when the second 4 second exposure is added the total effect is less 

 than that of a single 8 second exposure. The rate of recovery cor- 

 responds very closely to an exponential function of time. 



